Teenagers with body mass values (BMI) above 35 kg/m2 and co-morbidity are designated for medical disqualification from service in the IDF. Data show that there has been an increase in the incidence of these teenagers, specifically among the lower socioeconomic status. The purpose of this pilot study is to carry out an intervention Based lifestyle modification among a group of boys and girls with morbid obesity accompanied by a comorbidity that disqualifies them from service in the IDF. Definition of success: meeting the threshold of weight and health status that allows recruitment into the IDF. Criteria for finding candidates: * Boys and girls from the age of 15 who suffer from morbid obesity and comorbidity that may prevent their enlistment in the IDF. (This age range was chosen to allow an ideal period of at least one year to make a significant change). * Boys and girls who have their own and their family's willingness and commitment to participate in the process * A basic state of health that allows participation in the program. The screening process will be done by the staff of the endocrine unit, under the management of Prof. Orit Pinhas-Hamiel. Duration of intervention: 26 weekly sessions for the trainees. The duration of the meeting will be about three hours in the afternoon A decision whether to extend the duration of the intervention will be taken according to the initial results of the program. Activity location: Potential sites vary: Sheba// academic complex // military base for trainees. Number of participants - 25, (dropout expected 30%) Research goals (main content elements in the program) - there are 3 main content areas (of similar importance) * Education about the importance of service in the IDF and the opportunities inherent in it * Ability-adapted physical activity education and training * Guidance for a healthy diet * Psychological support \[The medical accompaniment to the program will take place on the basis of the patients' mother clinics and the medical follow-up of them will be done separately\].